A student in a lab experiment jumps upward off a common bathroom scale as the lab partner records the scale reading. What does the lab partner observe during the instant the student pushes off? The scale reading will remain unchanged during the entire time the student is in contact with the scale.

The scale reading will increase momentarily then will decrease as the student is moving upward from the scale.

The scale reading will increase during the entire time the student is in contact with the scale.

The scale reading will decrease momentarily then will increase as the student is moving upward from the scale.

The correct answer is (B)The scale reading will increase momentarily then will decrease as the student is moving upward from the scale.

According to the third law of motion, every action has an equal and opposite reaction. In order to jump, the student will apply force to the bathroom scale in downward direction and there will be an equal force exerted by the bathroom scale upwards on the student which helps him jump.

 So when the student applies downward force on the scale in order to jump, the scale reading will increase momentarily and then will decrease as the student moves upwards.

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B: The scale reading will increase momentarily then will decrease as the student is moving upward from the scale

Explanation:

The way weighing scale works is that when you climb on it, it will take your weight reading but when you are moving off the top of it, the reading slowly approaches 0 until you are completely off it.

Thus, the lab partner will observe that the reading will increase for a while and then gradually decrease to zero as the student moves upwards off the scale.

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